Data Integrity Instrumentation Checklists
Instrumentation Data Integrity Checklists
| |Online DPD Colorimetric Chlorine Analyzer (Example: Hach CL17) |
| |Sample tap is a sufficient distance downstream of chemical feed points to ensure adequate mixing and sufficient reaction time (in turbulent flow |
| |conditions 10 x pipe diameters is suggested, in laminar flow conditions more than 100 × pipe diameters is suggested) |
| |Sample tap orientation is “good” or “best” per Figure 1 |
| |Sample tap location is appropriate for measuring desired parameters (e.g., not measuring free chlorine after the addition of ammonia) |
| |Sample conditioning kit is installed correctly (see Figure 2; the drain tee should be installed 2’ above the instrument cabinet to ensure the needed |
| |sample pressure in the analyzer) |
| |Sample line length is not excessive (i.e., less than one minute residence time) |
| |Sample flow rate to sample conditioning is between 200 to 500 mL/min |
| |Correct reagents are installed (i.e., free chlorine indicator is installed when free chlorine is intended to be measured) |
| |Reagents are not expired |
| |Reagents bottles are connected to correct delivery tubes labeled “buffer” or “reagent” inside the instrument |
| |Indicator reagent is prepared as specified by the manufacturer (indicator powder is mixed and fully dissolved in the indicator solution) |
| |Stir bar is installed in the colorimeter cell (remove plug on the colorimeter and insert paper clip to remove) |
| |Pressure plate on peristaltic pump is securely attached (to avoid backflow of the sample into the reagents) |
| |Signal Averaging (SIGAVG) feature, which is used to average reading and prevent erratic recorder output, is disabled (default is SIGAVG = 1, which |
| |disables this feature) |
| |Calibration settings are at factory default (OFFSET = 0.00), the analyzer is factory calibrated and does not require recalibration unless specified |
| |by regulatory agency |
| |Record output span settings bracket the expected chlorine range of chlorine residual (i.e., factory default RECMIN = 0.00 mg/L @ 4 mA and RECMAX = |
| |5.00 mg/L @ 20 mA) |
| |Verify that the reading on the display of the online analyzer is the same as what is being shown on SCADA |
| |Alarm settings are configured at desired trip points, if this feature is activated (i.e., toggle to ALARM menu and then RECALL WARNINGS to display |
| |active alarms) |
| |Colorimeter cell is cleaned monthly when temperatures are less than 80 F and biweekly when temperatures are more than 80°F with 19.2 N sulfuric acid |
| |solution and cotton swabs |
| |Pump tubing is replaced per manufacturers recommendation (i.e., if ambient temperature is 80°F, replace |
| |at three-month intervals) |
| |Remaining analyzer tubing is replaced annually, per manufacturers recommendation |
| |Analyzer performance is verified at least once per week (within ±0.10 mg/L or ±15% of expected value [whichever is larger], per EPA Method 334) with |
| |an EPA approved grab sample method (e.g., DPD colorimetric method), which has also been verified (e.g., Spec Check Secondary Gel Standards) |
| |Online Amperometric Chlorine Analyzer (Example: Hach CL10sc with pH Sensor) |
| |Sample tap is a sufficient distance downstream of chemical feed points to ensure adequate mixing and sufficient reaction time (in turbulent flow |
| |conditions 10 x pipe diameters is suggested, in laminar flow conditions more than 100 × pipe diameters is suggested) |
| |Sample tap orientation is “good” or “best” per Figure 1 |
| |Sample tap location is appropriate for measuring desired parameters (e.g., not measuring free chlorine after the addition of ammonia) |
| |Sample line length is not excessive (i.e., as close and direct as reasonably possible ) |
| |Sample flow rate is maintained in the desired range of 500 to 833 mL/min, which can be confirmed if the LED light on the flow sensor is on (the exact|
| |flow rate is not important as long as flow is constantly maintained in that range) |
| |Pressure regulator (PRV or sample conditioning; see Figure 2) is installed if analyzer if it is under the influence of pressure/flow variations |
| |(e.g., under the influence of a storage tank or pumps) |
| |Analyzer is not under the influence of a heat source or in direct sunlight |
| |Analyzer is configured to measure the desired parameters (toggle to sensor setup menu), such as chlorine (total or free), pH (optional), and |
| |temperature (optional) |
| |Tubing (Teflon or PVDF) is replaced annually, per manufacturers recommendation |
| |Sensor flow cells are clean (i.e., free of sediment deposits and film, not discolored) |
| |Membrane cap on the chlorine sensor is replaced at least once per year (during replacement the electrode should be polished and electrolyte solution |
| |should be replaced) |
| |Electrolyte solution in the chlorine sensor is replaced every 3 to 6 months |
| |Electrolyte solution is not expired |
| |Chlorine sensor is replaced every three years |
| |Measurement span settings are at desired range (toggle to sensor setup menu) |
| |Alarm settings are configured at desired trip points, if this feature is activated (i.e., toggle to Sensor Setup menu and then Cal Watch to display |
| |active alarms) |
| |Chlorine analyzer performance is verified (and calibrated if needed) at least once per week (within ±0.10 mg/L or ±15% of expected value [whichever |
| |is larger], per EPA Method 334) with an EPA approved grab sample method (e.g., DPD colorimetric method), which has also been verified (e.g., Spec |
| |Check Secondary Gel Standards) |
| |pH sensor is calibrated (see Chlorine Sensor User Manual for details) at least weekly |
| |pH sensor is cleaned and inspected every 90 days (see pH Sensor User Manual for details) |
| |pH sensor is “rebuilt” (standard cell solution and salt bridge is replaced) every 3 to 6 months |
| |pH sensor is replaced every 4 to 5 years |
| |Online Nephelometric Turbidimeter w/90° Detector (Example: Hach 1720E) |
| |Sample tap is a sufficient distance downstream of chemical feed points to ensure adequate mixing and sufficient reaction time (in turbulent flow |
| |conditions 10 x pipe diameters is suggested, in laminar flow conditions more than 100 × pipe diameters is suggested) |
| |Sample line tapped into larger process pipe and sample tap orientation is “good” or “best” per Figure 1 |
| |Sample tap location is appropriate for measuring desired parameters (e.g., filter-to-waste sample location is representative of filter-to-waste |
| |sample). |
| |Sample line length is not excessive (i.e., as close and direct as reasonably possible ) |
| |Sample line does not have excessive elevation changes |
| |Sample pumping is to be avoided, if possible |
| |Sample flow rate to turbidimeter is between 200 and 750 mL/min and is verified quarterly (samples with high turbidity should operate at as high as |
| |flow rate as possible and without a bubble trap, while samples with low turbidity should operate at as low as flow rate as possible) |
| |Turbidimeter is installed indoors or in a location that is isolated from vibration, heat, and direct sunlight |
| |Turbidimeter head is securely seated on the turbidimeter body |
| |Lamp is replaced once per year, per manufacturers recommendation |
| |Turbidimeter is calibrated per manufacturer’s specifications at least once every three months during normal operation and after any significant |
| |maintenance or repair (check calibration/verification history) |
| |Turbidimeter body, bubble trap, and photocell window (do not disassemble or scratch) is thoroughly cleaned and rinsed as needed, or prior to |
| |calibration (see user’s manual for details) |
| |Verify that the reading on the display of the online analyzer is the same as what is being shown on SCADA |
| |Turbidimeter photocell contains a small air bubble |
| |Turbidimeter output mode is set to “HOLD” during calibration and maintenance activities |
| |Turbidimeter error mode is set to “TRANSFER” during normal operation and transfer value is set to 0.00 or 20.00 NTU |
| |Turbidimeter calibration is verified at least once every weekly |
| |Turbidimeter date and time stamp is verified during calibration and after power outages |
| |Turbidimeter sample line is inspected during calibration and replaced as needed (raw water sample lines will need to be replaced more frequently that|
| |filtered water sample lines) |
| |Turbidimeter lamp assembly is replaced at least once per year (per manufacturer’s specifications) |
| |Turbidimeter data log interval (DATALOG INTRVL) is at desired setting (≤ 1 minute is recommended) |
| |Turbidimeter output signal span is set to 0.00 to 5.10 NTU |
| |Turbidimeter bubble reject (BUBBLE REJECT) setting is at desired setting (enabled, or yes, is recommended) |
| |Turbidimeter signal averaging setting (SIGNAL AVG) is at desired interval (30 second interval is recommended) |
| |Turbidimeter offset value (OFFSET) is at desired setting (0.00 NTU is factory default) |
| |Online Laser Turbidimeter (Example: Hach FilterTrak 660sc) |
| |Sample tap is a sufficient distance downstream of chemical feed points to ensure adequate mixing and sufficient reaction time (in turbulent flow |
| |conditions 10 x pipe diameters is suggested, in laminar flow conditions more than 100 × pipe diameters is suggested) |
| |Sample line tapped into larger process pipe and orientation is adequate (see Figure 1) |
| |Sample line length is not excessive (i.e., as close and direct as reasonably possible ) |
| |Sample flow rate to turbidimeter is between 100 and 750 mL/min (samples with high turbidity should operate at as high as flow rate as possible, |
| |while samples with low turbidity should operate at as low as flow rate as possible) |
| |Turbidimeter is installed indoors in location that is isolated from vibration, heat, and direct sunlight |
| |Turbidimeter head is securely seated on the turbidimeter body |
| |Turbidimeter is calibrated per manufacturer’s specifications at least once every three months during normal operation and after any significant |
| |maintenance or repair (check calibration/verification history) |
| |Turbidimeter is cleaned at least once per month and prior to calibration (see user’s manual for details) |
| |Turbidimeter output mode is set to “hold” during calibration and maintenance activities |
| |Turbidimeter calibration is verified at least once every month (check calibration/verification history) |
| |Turbidimeter data log interval (DATALOG INTRVL) is at desired setting (≤ 1 minute is recommended) |
| |Turbidimeter bubble reject (BUBBLE REJECT) setting is at desired setting (enabled, or yes, is recommended) |
| |Turbidimeter signal averaging setting (SIGNAL AVG) is at desired interval (30 second interval is recommended) |
| |Turbidimeter offset value (OFFSET) is at desired setting based on calibration (0 mNTU is factory default) |
| |Online Nephelometric Laser Turbidimeter w/360° x 90° Detector (Example: Hach TU5300 sc, Hach TU5400 sc) |
| |Sample tap is a sufficient distance downstream of chemical feed points to ensure adequate mixing and sufficient reaction time (in turbulent flow |
| |conditions 10 x pipe diameters is suggested, in laminar flow conditions more than 100 × pipe diameters is suggested) |
| |Sample line tapped into larger process pipe and sample tap orientation is “good” or “best” per Figure 1 |
| |Sample tap location is appropriate for measuring desired parameters (e.g., filter-to-waste sample location is representative of filter-to-waste |
| |sample). |
| |Sample line length is not excessive (i.e., as close and direct as reasonably possible) |
| |Sample line does not have excessive elevation changes |
| |Sample pumping is to be avoided, if possible |
| |Sample line pressure does not exceed 87 psi |
| |Sample flow rate to turbidimeter is between 200 and 500 mL/min and is verified quarterly (samples with high turbidity should operate at as high as |
| |flow rate as possible and without a bubble trap, while samples with low turbidity should operate at as low as flow rate as possible); if equipped, |
| |confirm flow rate on flow sensor |
| |Turbidimeter is installed indoors or in a location that is isolated from vibration, heat, and direct sunlight |
| |Turbidimeter is not installed in immediate proximity of televisions, radios, computers, or other electronic equipment. This instrument is |
| |sensitive to electromagnetic and electromechanical interference. |
| |Turbidimeter is installed in a vertical position and is level |
| |Vial is cleaned at least once every three months |
| |Vial is replaced at least every two years |
| |Desiccant cartridge is replaced at least every two years or as identified by instrument notification |
| |Turbidimeter is calibrated per manufacturer’s specifications at least once every three months during normal operation and after any significant |
| |maintenance or repair (check calibration/verification history) |
| |Verify that the reading on the display of the online analyzer is the same as what is being shown on SCADA |
| |Turbidimeter output mode is set to “HOLD” during calibration and maintenance activities |
| |Turbidimeter error mode is set to “TRANSFER” during normal operation and transfer value is set to 0.00 or 20.00 NTU |
| |Turbidimeter calibration is verified at least once every week |
| |Turbidimeter date and time stamp is verified during calibration and after power outages |
| |Turbidimeter sample line is inspected during calibration and replaced as needed (raw water sample lines will need to be replaced more frequently |
| |that filtered water sample lines) |
| |Turbidimeter data log interval (DATALOG INTRVL) is at desired setting (≤ 1 minute is recommended). The default setting for this instrument is 10 |
| |minutes, which is greater than desired. |
| |Turbidimeter output signal span is set to 0.00 to 5.1 NTU |
| |Turbidimeter bubble reject (BUBBLE REJECT) setting is at desired setting (enabled, or yes, is recommended) |
| |Turbidimeter signal averaging setting (SIGNAL AVG) is at desired interval (30 second interval is recommended) |
| |Turbidimeter offset value (OFFSET) is at desired setting (0.00 NTU is factory default) |
| |Portable Colorimeter (Example: Hach Pocket II, DR800, or DR900 Colorimeters) |
| |Appropriate method (or program number) is used for anticipated sample concentration (LR, MR, HR; see Table 1) |
| |Appropriate sample volume is used (10 or 25 mL; see Table 1) |
| |Appropriate sample cell is used (plastic or glass; see Table 1) |
| |Appropriate sample reaction time is used (total chlorine reaction time is temperature dependent; see Table 1 and/or user’s manual) |
| |Sample cells are clean and not scratched |
| |Sample cells are consistently oriented in the appropriate position in the colorimeter (i.e., white diamond consistently faces towards the front of |
| |the instrument) |
| |Sample cells are consistent material and condition (e.g., visually identical) |
| |Instrument cap is securely placed on top of instrument prior to analysis |
| |Excess liquid (e.g., condensation) and finger prints are wiped from sample cells prior to analysis with a lint-free cloth |
| |Appropriate reagent is used (free or total chlorine; for 10 or 25 mL samples; see Table 1) |
| |If a reagent dispenser is used (e.g., Hach SwiftTest kit), confirm that humidity is not causing reagent to clog in the dispenser |
| |If a reagent dispenser is used (e.g., Hach SwiftTest kit), confirm that the reagent cartridge is used within 6 months after opening |
| |Reagents are not expired |
| |Reagent blank value is determined for each new lot of reagent (i.e., replace the sample in the test procedure with deionized water to determine |
| |reagent blank value, which will be subtracted from all sample results to account for “baseline” color development). It is recommended that the |
| |reagent blank value is written on the package of reagent, including date and operator initials. |
| |Separate sample cells are labeled and used for free and total chlorine analysis |
| |Colorimeter performance is verified (e.g., Spec Check Secondary Gel Standards, primary standards) at least weekly during routine use or before each |
| |use during infrequent use |
| |Instrument is using the most current software/firmware (check manufacturer’s website) |
| |Instrument is re-zeroed at each sample location (if used for distribution system sampling) |
| |Instrument is displaying the desired test results (concentration, Abs, %T) |
| |Instrument is displaying the desired units (e.g., mg/L as NH3-N vs. NH3) |
| |Sample cells are rinsed well between samples using deionized water or fresh sample |
| |Sample cells are capped and gently inverted prior to analysis (after the reaction time is complete) to remove any bubbles that may have accumulated |
| |on the sample cell wall (common issue with plastic sample cells) |
| |Samples are not left in direct sunlight (both before and after the addition of reagent) |
| |Factory default calibration is not adjusted (unless asked to do so by regulatory agency) |
| |Samples are analyzed immediately and are not preserved for later analysis |
| |Sample locations are adequately flushed, so that the sample is representative water quality at the desired location (i.e., calculated flush time |
| |concept) |
| |Plastic containers are not used to collect samples (plastic can have chlorine demand) |
| |Operator is following the most recent version of the method procedure (method procedures are updated periodically to improve performance; check |
| |manufacturer’s website) |
| |Operator is aware of potential interferences with reagents (e.g., oxidized manganese can interfere with DPD reagent) |
| |Portable Parallel Analyzer (Example: Hach SL1000) |
| |Instrument is using the most current software/firmware (check manufacturer’s website) |
| |Analyzer performance is verified with a primary or secondary standard (e.g., System Verification Chemkey) at least once per week during routine use |
| |or before each use during infrequent use |
| |Probes (e.g., pH, conductivity) are calibrated before each use |
| |Reagents are not expired |
| |Operator is following the most recent version of the method procedure (method procedures are updated periodically to improve performance; check |
| |manufacturer’s website) |
| |Operator is aware of potential interferences with reagents (e.g., manganese can interfere with DPD reagent) |
| |Sample locations are adequately flushed, so that the sample is representative water quality at the desired location (i.e., calculated flush time |
| |concept) |
| |Appropriate Chemkey is used for desired method; the analyzer automatically identifies the parameter(s) being analyzed when Chemkey(s) are installed |
| |and/or probe(s) are connected |
| |Chemkeys are installed and recognized by the analyzer without receiving an error message (e.g., expired reagent, Chemkey leaked) prior to placing in|
| |sample tray |
| |Sample tray is rinsed well between samples using deionized water or fresh sample |
| |Appropriate sample volume is added to sample tray (i.e., filled to line) |
| |Samples are analyzed immediately and are not preserved for later analysis |
| |Benchtop Turbidimeter (Example: Hach 2100 Series) |
| |Turbidimeter is located on stable, level surface that is free of vibration |
| |Turbidimeter is not located in direct sunlight or near a heat source |
| |Turbidimeter is calibrated at least every three months or as specified by regulatory agency |
| |Turbidimeter is calibrated per manufacturers recommendations (e.g., Hach 2100Q should be calibrated at 20, 100, and 800 NTU and then verified at 10 |
| |NTU) |
| |Turbidimeter is calibrated using formazin or other approved standards. Consult safety data sheet to determine appropriate handling and disposal. |
| |Turbidimeter and standards are both at ambient temperature during calibration |
| |Sealed vial standards (e.g., StablCal) standards are stored at approximately 40°F, if used less than once per month |
| |Turbidimeter is left “on” 24 hours a day if it used regularly (per manufacturer’s recommendation) |
| |Turbidimeter is “on” at least 30 minutes (ratio on) and 60 minutes (ratio off) prior to analysis |
| |Silicone oil is used on sealed vial standards and sample vials prior to calibration/analysis (see user’s manual for procedure) |
| |Vials are placed in the cell holder with the triangle on the vial aligned with the reference mark on the sample cell holder |
| |Turbidimeter calibration is verified at least once per week using secondary standards (e.g., Gelex), which should be ±5% of the value recorded on |
| |the secondary standard vial |
| |Sample cells are not dirty, scratched, or damaged (see user’s manual for cleaning procedure) |
| |Sample cells are free of condensation (common when water temperature is cooler; see user’s manual) |
| |Sample cells are filled with distilled or deionized water during storage |
| |Sample cells are indexed and matched (see user’s manual for procedure) |
| |Samples are mixed by gentle inversion prior to analysis |
| |Air bubbles are removed, if present (see user’s manual for various techniques) |
| |Samples are analyzed immediately after they are collected (changes in temperature and settling can occur) |
| |Turbidimeter ranging setting (RANGE) is set to “automatic” (recommended by manufacturer) |
| |Turbidimeter signal averaging setting (SIGNAL AVG) is “on” (recommended by manufacturer) |
| |Turbidimeter ratio setting (RATIO) is “on” (recommended by manufacturer) |
Appendix A: Supplemental Information
[pic]
Figure 1: Sample Line Location in Process Stream (Hach Company)
[pic]
Figure 2: Sample Conditioning Kit Configuration
Table 1: DPD Chlorine Method Summary for Portable Colorimeters (Hach Company)
|Colorimeter Type |Method Specifications |Low Range |Mid-Range |High Range |
| | |(0.02 to 2.00 mg/L) |(0.05 to 4.00 mg/L) |(0.1 to 8.0 mg/L) |
|Hach |Method |Total: 8167 |N/A | |
|Pocket II | |Free: 8021 | | |
| |Cell Type |Glass | |Plastic (1 cm) |
| |Sample Volume |10 mL | |5 mL |
| |Powder Pillow |1 x 10 mL pillow | |2 x 10 mL pillows |
| |Precision |@ 1.00 mg/L ± 0.05 mg/L | |@ 5.0 mg/L ± 0.2 mg/L |
| |Reaction Time |Total: 3 min (varies by temp.) | |Total: 3 min (varies by temp.) |
| | |Free: Immediate (< 1 min) | |Free: Immediate (< 1 min) |
|Hach |Method |Total: 8167 |Total: 10250 |N/A |
|DR 800 Series | |Free: 8021 |Free: 10245 | |
| |Program Number |9 |114 | |
| |Cell Type |Glass |Glass | |
| |Sample Volume |10 mL |10 mL | |
| |Powder Pillow |1 x 10 mL pillow |1 x 25 mL pillow | |
| |Precision |@ 1.00 mg/L ± 0.01 mg/L |@ 1.50 ± 0.02 mg/L | |
| |Reaction time |Total: 3 min (varies by temp.) |Total: 3 min (varies by temp.) | |
| | |Free: Immediate (< 1 min) |Free: Immediate (< 1 min) | |
|Hach |Method |Total: 8167 |Total: 10250 |N/A |
|DR 900 Series | |Free: 8021 |Free: 10245 | |
| |Program Number |80 |87 | |
| |Cell Type |Glass |Glass | |
| |Sample Volume |10 mL |10 mL | |
| |Powder Pillow |1 x 10 mL pillow |1 x 25 mL pillow | |
| |Precision |@ 1.25 mg/L ± 0.02 mg/L |@ 2.10 mg/L ± 0.02 mg/L | |
| |Reaction Time |Total: 3 min (varies by temp.) |Total: 3 min (varies by temp.) | |
| | |Free: Immediate (< 1 min) |Free: Immediate (< 1 min) | |
-----------------------
Source: Hach Company (2014)
Install Sample Flow Regulator 24 inches above Instrument
Source: Hach Company (2014)
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